Image of soldiers carrying rifles and machine guns, standing guard in front of a U.S. Mail Express propeller airplane on a field in Chicago, Illinois. A man in the background is standing on the lower wing of the plane near the cockpit.

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Image of soldiers carrying rifles and machine guns, standing guard in front of a U.S. Mail Express propeller airplane on a field in Chicago, Illinois. A man in the background is standing on the lower wing of the plane near the cockpit.